Home / 21,205.40-31,808.10-12,901.70

Finding the Fourth Proportional to 21,205.40, 31,808.10 and 12,901.70

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Solution

The fourth proportional to 21,205.40, 31,808.10 and 12,901.70 is: 19,352.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,205.40 : 31,808.10 = 12,901.70 : x
  2. Step 2: Convert to fraction form
    21,205.40/31,808.10 = 12,901.70/x
  3. Step 3: Cross multiply
    21,205.40x = 31,808.10 × 12,901.70
  4. Step 4: Simplify right side
    21,205.40x = 410,378,563.77
  5. Step 5: Solve for x
    x = 410,378,563.77/21,205.40
  6. Step 6: Final answer
    x = 19,352.55

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.